Fan working computer does not start the troubleshooting method

Believe that many users have encountered the power switch, the fan works but the computer does not start, for the system after the boot of a small number of problems, most users can also be resolved, but encountered even on the boot can not start the problem, most users do not know where to start to solve. In fact, the computer can not start the failure of the normal troubleshooting is not difficult, today small series on the fan work but the host can not start the failure to resolve the computer to start the trouble.

The fan working computer cannot start the troubleshooting method:

1. Power switch Failure

When the power switch button is not reset due to aging, or the chassis front panel because of the deformation caused by the power switch button press can not be reset in time, using the switch is always in the state, then the power switch will appear after the host power-up start, but after 4 seconds will automatically shutdown.

Troubleshooting methods:

Unplug the panel switch connected with the motherboard pw_on interface, directly with a small screwdriver short patch jumper, observe whether the host still 4 seconds shutdown failure. If the failure disappears, you can conclude that there is a problem with the switching circuit.

2.RESET switch or jumper is shorted

This type of failure is not a lot of opportunities, but with the increase in the use of computer time, the reset key use of the non-self-locking button switch will be due to the elastic failure of the press can not bounce, resulting in always connected state, or because the chassis front panel button installation is not in place or deformation, The reset switch button can not be reset in time after being pressed, and is in the state of being connected for a long time. It may also be because of user overhaul process, pull, pull plug inadvertently caused reset line short connection. At this point, when we press the power switch, because the motherboard is always in the reset state, although the mains has been connected, the CPU fan and Power fan, video card fan, the motherboard fan has started to work, but the host does not have any boot traces.

Troubleshooting methods:

If a debug card is inserted into the PCI slot, the user will immediately find that the reset lamp is always bright, and normally, the RST light only after the reset button is lit, you can determine the power of the reset related short connection phenomenon.

3. Memory failure

Memory of a chip or capacitance failure, sometimes will be able to power up after the host can be added, but there is no normal start "beep" sound, there is no memory alarm sound, long time can not start. It is also possible that if the CMOS settings when the frequency of memory or related parameters set incorrectly, there will be power to add the host power, but is not to start and no alarm sound phenomenon.

Troubleshooting methods:

For such a failure you can first unplug the memory and then boot, if the host memory alarm, the CPU and host basic normal. Then try to clear the CMOS settings to see if the failure can be resolved, if the troubleshooting indicates that the cause of the fault is due to the memory parameter set in the CMOS error caused, generally can be ruled out memory failure.

4.DMI data Setup Error or ESCD data cannot be automatically updated

The DMI (Desktop Management information) data is a collection of data stored in the BIOS chip to facilitate system calls and verifies that the DMI data is correct every time the system starts. However, I have not encountered any failures that cause the system to fail due to DMI data errors.

ESCD (Extended System confirguation data) is stored in a CMOS chip to manage the collection of resource configuration data for a computer. With the rapid development of the computer and the application of Plug and Play technology, in order to avoid the conflict of resource occupancy, it is necessary to allocate limited system resources (such as address, IRQ,DMA, etc.) because of the rapid increase of computer peripheral resources, such as ACPI, APM, USB, MODEM, INC, VGA card, etc. Will cause the computer self-test time increases, causes the startup time to be too long.

In practical use, the computer Board card is not frequent, does not need each time carries on the detailed self-test, therefore the computer has designed the ESCD data to simplify the computer to start the process, if the computer does not have the hardware change, when starts the computer to call the ESCD data directly to allocate the system resources, the control computer operation, To save your computer's startup time.

When the user changes the hardware of the computer, such as changing the CPU type, replaced the memory, increased memory, acquired the optical drive, replacement graphics, etc., if not forced to update the ESCD data, then the computer will still be in the old configuration to allocate system hardware resources, At this point, there will be a failure to start properly or not recognize the newly acquired hardware.

Troubleshooting methods:

Just go into the CMOS settings "Pnp/pci CONFIGURATION" → set "reset ESCD" to "Enabled" (the option is automatically converted to disabled after you restart the computer).

5.BIOS chip oxidation or bad contact

Each computer motherboard has a flash chip to store the BIOS program code, now the hard disk, optical drive, graphics, MP3, mobile phones have similar chip storage Fireware program, can be easily updated to provide new features. However, for some motherboard BIOS to facilitate updates and upgrades, BIOS chip is through the IC socket with the motherboard communication, due to the use of the environment, the chip pins will be due to oxidation and contact bad, which led to the host power after the BIOS can not complete the loading of the program, resulting in the host although can be added power, but no start traces.

Troubleshooting methods:

Start the computer after the power of the first action is address jump, the CPU began to execute the BIOS in the program code to complete the computer self-test process. This process is very short, only a two seconds, the user using the debug card can be found that the BIOS light only when the restart power when the flashing a few times has been in the state of extinction. If the BIOS light is always on, the computer will not boot properly because the CPU is unable to complete the process of loading the BIOS code.

6. The video card related circuit has the malfunction to cause the monitor not to display

If the video card and host communication is normal, but the DAC circuit graphics card failure, resulting in the graphics card output signal can not be transmitted to the monitor, although the host has a normal start beep, but the monitor no image display.

Troubleshooting methods:

Check whether the monitor is normal, the signal connection is normal, the interface pins have no oxidation contact phenomenon, if none can only through the replacement method to determine the failure of the graphics card. In addition, the loose video card caused by poor contact with the AGP slot will also cause the host to power up only after the fan, but is not started.

7.CPU Auxiliary power supply connector not connected, causing CPU to not complete initialization

As the power consumption of the PIVCPU is increasing and the power supply of the ATX20 pin is not enough to satisfy the pivcpu demand, the ATX power supply is upgraded from version 2.03 to ATX 12V, and the 4-pin 12VCPU auxiliary power supply interface is provided on the PIV board. Used to extend the power supply current of the CPU.

Troubleshooting methods:

Check whether the power supply is normal, matching, if the use of power is small or not connected to the auxiliary power Interface, the host may be able to add electricity, but because of the supply of power to the CPU is insufficient, resulting in the CPU can not complete initialization and performance as the host did not bootstrap start process.

8. The memory auxiliary power supply interface is not connected, resulting in insufficient memory power supply

Now memory power consumption is also increasing, the PIV high grade motherboard provides a 6-pin memory auxiliary power interface to reduce the memory-powered connection resistance, providing greater operating current for memory.

Troubleshooting methods:

Check whether the memory is working properly, if the user uses more memory, and no connection memory auxiliary power interface, there will be a class of CPU power shortage phenomenon, the boot memory alarm or not normal startup phenomenon.

9. Hard drive, optical drive, floppy drive performance partially damaged

This situation usually occurs on the hard drive, optical drive, floppy drive circuit, motor not complete short-circuit, not to cause direct protection of the host switching power supply, but only the power consumption of the host, resulting in the overall supply of the host is insufficient, resulting in the host can not successfully complete the process or self-test time is particularly long, performance for the host slow or can not start

Troubleshooting methods:

Check the hard drive, optical drive, floppy drive is working properly, if there is insufficient power supply, replace the power supply or replace the low power drive, optical drive, floppy drive.

10. Filter capacitor bubble, leakage, loss of capacity

On the motherboard on the CPU or around the memory of the filter capacitor because of long-term high-temperature environment in the bubble, leakage, loss of capacity and the motherboard CPU or memory power supply environment, resulting in the host can not start.

Troubleshooting methods:

The fault is that the CPU fan is working properly after the power is added, but the host has no response or alarm. But this kind of breakdown sometimes can appear to replace different switch power supply some can start normally, need to notice.

Through the small series of the above introduction, I believe that we have a fan working computer can not start the fault has a certain understanding, and according to the introduction of small series to troubleshoot the problem, fully solve the computer problems.